mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/hal/TARGET_NXP/TARGET_LPC43XX/analogin_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /* mbed Microcontroller Library |
bogdanm | 0:9b334a45a8ff | 2 | * Copyright (c) 2006-2013 ARM Limited |
bogdanm | 0:9b334a45a8ff | 3 | * |
bogdanm | 0:9b334a45a8ff | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
bogdanm | 0:9b334a45a8ff | 5 | * you may not use this file except in compliance with the License. |
bogdanm | 0:9b334a45a8ff | 6 | * You may obtain a copy of the License at |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
bogdanm | 0:9b334a45a8ff | 9 | * |
bogdanm | 0:9b334a45a8ff | 10 | * Unless required by applicable law or agreed to in writing, software |
bogdanm | 0:9b334a45a8ff | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
bogdanm | 0:9b334a45a8ff | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
bogdanm | 0:9b334a45a8ff | 13 | * See the License for the specific language governing permissions and |
bogdanm | 0:9b334a45a8ff | 14 | * limitations under the License. |
bogdanm | 0:9b334a45a8ff | 15 | * |
bogdanm | 0:9b334a45a8ff | 16 | * Ported to NXP LPC43XX by Micromint USA <support@micromint.com> |
bogdanm | 0:9b334a45a8ff | 17 | */ |
bogdanm | 0:9b334a45a8ff | 18 | #include "mbed_assert.h" |
bogdanm | 0:9b334a45a8ff | 19 | #include "analogin_api.h" |
bogdanm | 0:9b334a45a8ff | 20 | #include "cmsis.h" |
bogdanm | 0:9b334a45a8ff | 21 | #include "pinmap.h" |
bogdanm | 0:9b334a45a8ff | 22 | #include "mbed_error.h" |
bogdanm | 0:9b334a45a8ff | 23 | #include "gpio_api.h" |
bogdanm | 0:9b334a45a8ff | 24 | |
bogdanm | 0:9b334a45a8ff | 25 | #define ANALOGIN_MEDIAN_FILTER 1 |
bogdanm | 0:9b334a45a8ff | 26 | |
bogdanm | 0:9b334a45a8ff | 27 | static inline int div_round_up(int x, int y) { |
bogdanm | 0:9b334a45a8ff | 28 | return (x + (y - 1)) / y; |
bogdanm | 0:9b334a45a8ff | 29 | } |
bogdanm | 0:9b334a45a8ff | 30 | |
bogdanm | 0:9b334a45a8ff | 31 | static const PinMap PinMap_ADC[] = { |
bogdanm | 0:9b334a45a8ff | 32 | {P4_3, ADC0_0, 0}, |
bogdanm | 0:9b334a45a8ff | 33 | {P4_1, ADC0_1, 0}, |
bogdanm | 0:9b334a45a8ff | 34 | {PF_8, ADC0_2, 0}, |
bogdanm | 0:9b334a45a8ff | 35 | {P7_5, ADC0_3, 0}, |
bogdanm | 0:9b334a45a8ff | 36 | {P7_4, ADC0_4, 0}, |
bogdanm | 0:9b334a45a8ff | 37 | {PF_10, ADC0_5, 0}, |
bogdanm | 0:9b334a45a8ff | 38 | {PB_6, ADC0_6, 0}, |
bogdanm | 0:9b334a45a8ff | 39 | {PC_3, ADC1_0, 0}, |
bogdanm | 0:9b334a45a8ff | 40 | {PC_0, ADC1_1, 0}, |
bogdanm | 0:9b334a45a8ff | 41 | {PF_9, ADC1_2, 0}, |
bogdanm | 0:9b334a45a8ff | 42 | {PF_6, ADC1_3, 0}, |
bogdanm | 0:9b334a45a8ff | 43 | {PF_5, ADC1_4, 0}, |
bogdanm | 0:9b334a45a8ff | 44 | {PF_11, ADC1_5, 0}, |
bogdanm | 0:9b334a45a8ff | 45 | {P7_7, ADC1_6, 0}, |
bogdanm | 0:9b334a45a8ff | 46 | {PF_7, ADC1_7, 0}, |
bogdanm | 0:9b334a45a8ff | 47 | {NC, NC, 0 } |
bogdanm | 0:9b334a45a8ff | 48 | }; |
bogdanm | 0:9b334a45a8ff | 49 | |
bogdanm | 0:9b334a45a8ff | 50 | void analogin_init(analogin_t *obj, PinName pin) { |
bogdanm | 0:9b334a45a8ff | 51 | ADCName name; |
bogdanm | 0:9b334a45a8ff | 52 | |
bogdanm | 0:9b334a45a8ff | 53 | name = (ADCName)pinmap_peripheral(pin, PinMap_ADC); |
bogdanm | 0:9b334a45a8ff | 54 | MBED_ASSERT(obj->adc != (LPC_ADC_T *)NC); |
bogdanm | 0:9b334a45a8ff | 55 | |
bogdanm | 0:9b334a45a8ff | 56 | // Set ADC register, number and channel |
bogdanm | 0:9b334a45a8ff | 57 | obj->num = (name >> ADC0_7) ? 1 : 0; |
bogdanm | 0:9b334a45a8ff | 58 | obj->ch = name % (ADC0_7 + 1); |
bogdanm | 0:9b334a45a8ff | 59 | obj->adc = (LPC_ADC_T *) (obj->num > 0) ? LPC_ADC1 : LPC_ADC0; |
bogdanm | 0:9b334a45a8ff | 60 | |
bogdanm | 0:9b334a45a8ff | 61 | // Reset pin function to GPIO |
bogdanm | 0:9b334a45a8ff | 62 | gpio_set(pin); |
bogdanm | 0:9b334a45a8ff | 63 | // Select ADC on analog function select register in SCU |
bogdanm | 0:9b334a45a8ff | 64 | LPC_SCU->ENAIO[obj->num] |= (1 << obj->ch); |
bogdanm | 0:9b334a45a8ff | 65 | |
bogdanm | 0:9b334a45a8ff | 66 | // Calculate minimum clock divider |
bogdanm | 0:9b334a45a8ff | 67 | // clkdiv = divider - 1 |
bogdanm | 0:9b334a45a8ff | 68 | uint32_t PCLK = SystemCoreClock; |
bogdanm | 0:9b334a45a8ff | 69 | uint32_t adcRate = 400000; |
bogdanm | 0:9b334a45a8ff | 70 | uint32_t clkdiv = div_round_up(PCLK, adcRate) - 1; |
bogdanm | 0:9b334a45a8ff | 71 | |
bogdanm | 0:9b334a45a8ff | 72 | // Set the generic software-controlled ADC settings |
bogdanm | 0:9b334a45a8ff | 73 | obj->adc->CR = (0 << 0) // SEL: 0 = no channels selected |
bogdanm | 0:9b334a45a8ff | 74 | | (clkdiv << 8) // CLKDIV: |
bogdanm | 0:9b334a45a8ff | 75 | | (0 << 16) // BURST: 0 = software control |
bogdanm | 0:9b334a45a8ff | 76 | | (1 << 21) // PDN: 1 = operational |
bogdanm | 0:9b334a45a8ff | 77 | | (0 << 24) // START: 0 = no start |
bogdanm | 0:9b334a45a8ff | 78 | | (0 << 27); // EDGE: not applicable |
bogdanm | 0:9b334a45a8ff | 79 | } |
bogdanm | 0:9b334a45a8ff | 80 | |
bogdanm | 0:9b334a45a8ff | 81 | static inline uint32_t adc_read(analogin_t *obj) { |
bogdanm | 0:9b334a45a8ff | 82 | uint32_t temp; |
bogdanm | 0:9b334a45a8ff | 83 | uint8_t channel = obj->ch; |
bogdanm | 0:9b334a45a8ff | 84 | LPC_ADC_T *pADC = obj->adc; |
bogdanm | 0:9b334a45a8ff | 85 | |
bogdanm | 0:9b334a45a8ff | 86 | // Select the appropriate channel and start conversion |
bogdanm | 0:9b334a45a8ff | 87 | pADC->CR |= ADC_CR_CH_SEL(channel); |
bogdanm | 0:9b334a45a8ff | 88 | temp = pADC->CR & ~ADC_CR_START_MASK; |
bogdanm | 0:9b334a45a8ff | 89 | pADC->CR = temp | (ADC_CR_START_MODE_SEL(ADC_START_NOW)); |
bogdanm | 0:9b334a45a8ff | 90 | |
bogdanm | 0:9b334a45a8ff | 91 | // Wait for DONE bit and read data |
bogdanm | 0:9b334a45a8ff | 92 | while (!(pADC->STAT & ADC_CR_CH_SEL(channel))); |
bogdanm | 0:9b334a45a8ff | 93 | temp = pADC->DR[channel]; |
bogdanm | 0:9b334a45a8ff | 94 | |
bogdanm | 0:9b334a45a8ff | 95 | // Deselect channel and return result |
bogdanm | 0:9b334a45a8ff | 96 | pADC->CR &= ~ADC_CR_START_MASK; |
bogdanm | 0:9b334a45a8ff | 97 | pADC->CR &= ~ADC_CR_CH_SEL(channel); |
bogdanm | 0:9b334a45a8ff | 98 | return ADC_DR_RESULT(temp); |
bogdanm | 0:9b334a45a8ff | 99 | } |
bogdanm | 0:9b334a45a8ff | 100 | |
bogdanm | 0:9b334a45a8ff | 101 | static inline void order(uint32_t *a, uint32_t *b) { |
bogdanm | 0:9b334a45a8ff | 102 | if (*a > *b) { |
bogdanm | 0:9b334a45a8ff | 103 | uint32_t t = *a; |
bogdanm | 0:9b334a45a8ff | 104 | *a = *b; |
bogdanm | 0:9b334a45a8ff | 105 | *b = t; |
bogdanm | 0:9b334a45a8ff | 106 | } |
bogdanm | 0:9b334a45a8ff | 107 | } |
bogdanm | 0:9b334a45a8ff | 108 | |
bogdanm | 0:9b334a45a8ff | 109 | static inline uint32_t adc_read_u32(analogin_t *obj) { |
bogdanm | 0:9b334a45a8ff | 110 | uint32_t value; |
bogdanm | 0:9b334a45a8ff | 111 | #if ANALOGIN_MEDIAN_FILTER |
bogdanm | 0:9b334a45a8ff | 112 | uint32_t v1 = adc_read(obj); |
bogdanm | 0:9b334a45a8ff | 113 | uint32_t v2 = adc_read(obj); |
bogdanm | 0:9b334a45a8ff | 114 | uint32_t v3 = adc_read(obj); |
bogdanm | 0:9b334a45a8ff | 115 | order(&v1, &v2); |
bogdanm | 0:9b334a45a8ff | 116 | order(&v2, &v3); |
bogdanm | 0:9b334a45a8ff | 117 | order(&v1, &v2); |
bogdanm | 0:9b334a45a8ff | 118 | value = v2; |
bogdanm | 0:9b334a45a8ff | 119 | #else |
bogdanm | 0:9b334a45a8ff | 120 | value = adc_read(obj); |
bogdanm | 0:9b334a45a8ff | 121 | #endif |
bogdanm | 0:9b334a45a8ff | 122 | return value; |
bogdanm | 0:9b334a45a8ff | 123 | } |
bogdanm | 0:9b334a45a8ff | 124 | |
bogdanm | 0:9b334a45a8ff | 125 | uint16_t analogin_read_u16(analogin_t *obj) { |
bogdanm | 0:9b334a45a8ff | 126 | uint32_t value = adc_read_u32(obj); |
bogdanm | 0:9b334a45a8ff | 127 | |
bogdanm | 0:9b334a45a8ff | 128 | return (value << 6) | ((value >> 4) & 0x003F); // 10 bit |
bogdanm | 0:9b334a45a8ff | 129 | } |
bogdanm | 0:9b334a45a8ff | 130 | |
bogdanm | 0:9b334a45a8ff | 131 | float analogin_read(analogin_t *obj) { |
bogdanm | 0:9b334a45a8ff | 132 | uint32_t value = adc_read_u32(obj); |
bogdanm | 0:9b334a45a8ff | 133 | return (float)value * (1.0f / (float)ADC_RANGE); |
bogdanm | 0:9b334a45a8ff | 134 | } |